New Delhi: Aviation regulator DGCA on Thursday asked three office-bearers of the de-recognised Indian Pilots Guild (IPG), leading the pilots' strike, to appear before it on Monday and explain as to why their flying licenses should not be cancelled for not joining duty.

As the strike led by the IPG entered the 25th day, the Directorate General of Civil Aviation asked the three office- bearers to appear before it on June 4 and also explain why they had not replied to the show-cause notice issued to them on May 12, official sources said.

The show-cause notices were issued by DGCA to ten sacked pilots after Air India wrote to DGCA to seek an explanation from them as to why their licenses should not be cancelled for not reporting to work. Seven of them have submitted their replies to the notice.

With Air India pilots striking over issues relating to their career progression, government is likely to announce on Thursday a roadmap for implementing measures to integrate the pay-scales and seniority issues of the staff of the two erstwhile state-run airlines.

A four-member committee, headed by former Supreme Court judge D M Dharmadhikari, had recommended several steps on various HR and industrial relations issues to integrate the employees of erstwhile Indian Airlines and Air India, after their merger in 2007.

In its report submitted on January 31, the Dharmadhikari Committee had, among other things, recommended pay structure and incentives to Air India staffers in line with those of other public sector undertakings.

Official sources said Civil Aviation Minister Ajit Singh is likely to announce on Friday a roadmap for implementation of these recommendations, which have since been vetted by a panel of three officials.